Air purifier



1. Air purifier

1.1 is a front view of an air purifier showing the new design;

1.2 is a rear view thereof;

1.3 is a left view thereof;

1.4 is a right view thereof;

1.5 is a top view thereof;

1.6 is a bottom view thereof;

1.7 is a back, left perspective view thereof; and

1.8 is a front, left perspective view thereof.

The broken lines in the drawings illustrate portions of the air purifier and form no part of the claimed design. 

CLAIM The ornamental design for an air purifier, as shown and described. 